SOLUTION: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 85 pounds. A random sample of 100 newly manufactured cables has a mean breaking str

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Question 206754: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 85 pounds. A random sample of 100 newly manufactured cables has a mean breaking strength of 1800 pounds. Based on this sample,99% find a confidence interval for the true mean breaking strength of all cables produced by this manufacturer. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place
Answer by stanbon(75887) About Me  (Show Source):
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The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 85 pounds. A random sample of 100 newly manufactured cables has a mean breaking strength of 1800 pounds. Based on this sample,99% find a confidence interval for the true mean breaking strength of all cables produced by this manufacturer. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place
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sample mean = 1800
standard error = zs = 2.576[85/sqrt(100)] = 0.2576*85 = 21.896
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99% CI: 1800-21.896 < u < 1821.896
99% CI: 1778.1 < u < 1821.9
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Cheers,
Stan H.